Warp stop motion



H.' MARSH wARP STOP MOTION Jan. 21, 1936.

Filed Feb. 61, 1935 O T. V me A N w o om .du m i F m 7 6 L/ ATTORNEY.

Patented Jan. 21, 1936 I v 2,028,723,

UNETED STATES PATENT OFFIQE WARP STOP MOTION Harold Marsh, Pawtucket, R. I., assigner to Draper Corporation, Hopedale, Mass., a. corporation of Maine Application February 6, 1935, Serial No. 5,269 Claims. (Cl. 139-365) The present invention pertains to Warp stop natively, for reciprocation of the bar in an upper motions for looms and more particularly perposition, or in a lower position for the threading tains to the type of such stop motions wherein operation. The lower position of the detector a toothed detector bar is reciprocated in a toothed bar is such that the teeth on the bar and holder 5 holder to detect fallen drop wires. occupy the relative positions above mentioned, 5.,

Warp stop motions o'f the typ-e mentioned conwherein no threading bars are required. sist of one or more holders which are detachably The said preferred embodiment of the invenmounted so as to extend widthwise of the loom, tion is illustrated on the accompanying drawand endwise reciprocating detector bars mounted ing, of which:

in the holders. The bars and holders have Fig. 1 is a fragmentary perspective view of 1o! spaced teeth on their upper edges, to e-ngage a the warp stop motion. comprising said embodiallen drop wire and thereby effect loom stopment;

page. The drop Wires are supported by the warp Fig. 2 is a view in elevation, to an enlarged threads and are slotted to receive the detector scale, of a portion of the detector bar and holdl5 bars and holders. Usually, the teeth on the deer with the former in operative position; 1g; tector bars project above the teeth on the hold- Fig. 3 is a view similar to Fig. 2 but showing ers. y the detector bar in threading position; and

In the process of installing a new warp in a Fig. 4 is a View in cross-section taken approxiloom it is necessary to thread the drop wires mately on line 4--4, Fig. 2.

onto the detector bar and holder, or to thread The warp stop motion shown on the drawing 20,

the latter into a series of drop wires according is conventional in many respects, and is mounted to the particular procedure. Also, in the process on the loom in the conventional manner. Acof repairing a bad smash where a large numcordingly, there is shown on the drawing only ber of warp threads are broken, it is necessary such parts vof the stop motion as may be neces- V to move a large number of drop wires along the sary to a clear understanding of the invention. 25?v detector bar to make an opening in which to Referring more particularly to Fig. 1, the Warp work. In both instances, the projecting teeth threads W pass from the rear of the loom toward on the detector bar and holder so seriously hamthe iront thereof and the individual threads per relative movement between the latter and each support a drop Wire i between warp supthe drop wires as to require the provision of porting rods 2 and 3. The drop wires are slotted 30"- means for facilitating such movement. as at 4 to receive detector bars 5 and holders 6 Prior to the present invention, it has been the which extend widthwise or" the loom. The drop practice to provide sheet metal strips, commonly Wires may be arranged in a plurality of rows, called threading bars to cover the teeth on the thus requiring a plurality of detector bars and detector bars and thus facilitate the aforemenholders. 'Ihese latter parts may be duplicates 35* tioned threading operations. Such strips are and, accordingly, but one bar and holder will be not a part of the warp stop motion but are described in detail.

separate therefrom. Consequently, they are Each holder 5 is constructed to support a awkward and inconvenient to manipulate, and detector bar and to cooperate with the latter in frequently become mislaid or so bent or mutidetecting fallen drop wires. The specic form lated as to become valueless. of holder shown on the drawing is comprised of I propose to eliminate the necessity for such spaced sides '1, 'I which are connected at their threading bars by so constructing the warp stop bottoms as by being secured to a metal plate 9. motion that the detector bar can be moved to The holder is provided on its upper edge with a, threading position wherein the teeth on the spaced teeth i0, I9 of conventional form. The 45 detector bar project to the same height as the holder is detachably iixed in; end brackets, of teeth on the holder and fill the spaces between which only the bracket -H is shown, which the latter teeth. When in such position, the brackets are fixed to a loom in the conventional tops of the teeth on the bar and holder form manner.

a continuous surface which offers no opportunity The detector bar is provided with spaced teeth 50 for the drop wires to become caught, and addil2, l2 on its upper edge, of slightly greater tional parts such as the threading bars are not height than the teeth on the holder.` 'I'he detecnecessary. In the preferred embodiment of the tor bar is mounted in the holder for endwise invention, herein disclosed, the detector bar and reciprocation, i. e. it reciprocates widthwise of holder are constructed to support the bar, alterthe loom. Reciprocation of the bar may be ac- 55 complished by any conventional means such as the yieldable finger I3 which actuates the link I4, the latter detachably engaging a stud I5 in the detector bar.

When the detector bar is in operative position in the holder, the teeth I2 on the bar project above the teeth III on the holder (Figs. 1 and 2) and the range of movement of the bar is such that each tooth I2 passes back and forth completely past at least one space between the teeth on the holder. It will be apparent that if the only possible position of the detector bar in the holder is the operative position just described,

, the above-mentioned diculties in the threading operation will be encountered. The present in- Y vention provides for overcoming such difficulties by providing for supporting the bar in a threading position in the holder, as shown in Fig. 3.

It will be noted that in Fig. 3 the detector bar is lowered in the holder so that the teeth I2 on the bar project to the same height as 'the teeth I0 on the holder and are staggered with respect to the latter teeth so as to coincide with and fill the spaces therebetween. Thus, in the threading position, the top of the assembly comprising the detector bar and holder presents a continuous surface which offers no obstructions to relative movement between the assembly and fallen or unsupported drop wires.

In the broader aspects of my invention, the details of the means for alternatively supporting the detector bar in operative or threading positions are not important. The specific supporting means herein disclosed are, however, possessed of certain advantages, they being provided by cutting the bottom edge of the detector bar to form spaced bearing surfaces I6, I6 which cooperate with bearing surfaces I1, Il formed on the upper edge of the plate 9.

The bearing surfaces I6 and I'I are so positioned with regard to the teeth I0 and I2 that they support the detector bar in operative position when the latter is connected with the link I4. To move the detector bar to the threading position of Fig. 3 it is only necessary to disconnect the link I4 and move the bar endwise beyond its normal range of movement whereupon it will drop down to such threading position. It will be noted that the spaces between the bearing surfaces I'I must be slightly longer than the length of the bearing surfaces I6. Preferably, the detector bar is provided with cam surfaces I8 whereby an endwise pull on the detector bar will raise the bar up to operative position as it moves longitudinally from threading position.

Having fully disclosed the preferred embodiment of my invention, I claim:

1. In a warp stop motion for looms, the combination of a stationary holder having spaced teeth on its upper edge, and an endwise reciprocating detector bar mounted in said holder and having spaced teeth on its upper edge; said bar and holder being constructed to support the former for sliding movement in operative position in the holder with the teeth on the bar projecting above the teeth on the holder, and also to support the bar in threading position wherein the tops of the teeth on the bar are in the same plane as the tops of the teeth on the holder and form with the latter a substantially continuous surface.

2. In a warp stop motion for looms, the combination of a stationary holder having spaced teeth on its upper edge, an endwise movable detector bar having spaced teeth on its upper edge, and means normally supporting said bar for endwise reciprocation within said holder with the teeth on the bar projecting above the teeth on said holder, said means being constructed to also support said bar within said holder with the teeth on the bar projecting to the same height as and staggered with respect to the teeth on the holder for facilitating the threading of drop wires onto the bar and holder.

3. In a warp stop motion for looms, the comblnation of a stationary holder having spaced teeth on its upper edge, and an endwise reciprocating detector bar mounted in said holder and having spaced teeth on its upper edge; said bar and holder having cooperating bearing surfaces supporting the bar in operative position wherein the teeth on the bar project above the teeth on the holder, and said holder being constructed to support the bar in threading position wherein the teeth on the bar are aligned laterally of the bar and holder with the spaces between the teeth on the holder and project to the same height as the last said teeth.

4. In a warp stop motion for looms, the combination of a stationary holder having spaced teeth on its upper edge, and an endwise reciprocating detector bar mounted in said holder and having spaced teeth on its upper edge; said bar and holder being constructed to support the bar for reciprocation in an upward position wherein the teeth on the bar project above the teeth on the holder, said bar and holder also being constructed to support the bar in a relatively lower position wherein the teeth on the bar are aligned laterally of the bar and holder with the spaces between the teeth on the holder and project to the same height as the last said teeth.

5. In a warp stop motion for looms, the combination of a stationary holder having spaced sides each of which is provided with spaced teeth on its upper edge, and a detector bar reciprocably mounted between the sides of said holder and having spaced teeth on its upper edge; the said bar and holder being provided with cooperating bearing surfaces supporting said bar in operative position with the teeth on the latter projecting above the teeth on the holder, said bearing surfaces and holder being constructed to permit the bar to be lowered in the holder to a position wherein the teeth on the bar are in lateral alignment with the spaces between the teeth on the holder and project to the same height as the last said teeth, the tops of the teeth on the bar and holder forming a substantially continuous surface in a single horizontal plane, to facilitate the threading of drop wires onto the bar and holder.

HAROLD MARSH. 

